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Not a fan of chambered mufflers. Do you really want the flow battling itself to find a way out?
I don't.
Magnaflows have a tame, but deep, idle and bark real nice under heavy throttle. I run them now, and would buy them again in a heartbeat.
About a year ago I read a SAE article on high performance exhaust design. It was very technical with a lot of considerations on how to size and place the muffler and pipes to create a system that has no loss compared to open headers.
The two things I took from this article is that all performance mufflers sized properly flow more than than the engine generates and that it is easier to design a no loss system with chambered mufflers than it is with straight thru mufflers like the magnaflow or ultra flo.
After that article I just tell people to pick what sounds good to them.
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